Metasurfaces that control optical properties of thermal radiation generated within the metasurface itself

https://phys.org/news/2024-08-metasurfaces-thermal-unprecedented-ways.html

"metasurfaces that not only control through meticulously engineered nanopillar shapes arrayed across their surfaces, but also do not require external laser sources or bulky, expensive excitation setups, instead fed by internal incoherent oscillations of matter driven by heat... single structured layer with 2D pattern... asymmetric emission of circular polarization towards single direction... LEDs with defined frequencies, custom polarization, wavefront shape created hologram... geology, biology, military, space"